---
title: "CVE-2020-4067\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2020-4067?format=md
keywords: index, follow
---

# CVE-2020-4067

Publication date 29 June 2020

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2020-4067?format=md#impact-score)

Toggle side navigation

## Description

In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN
response buffer is not initialized properly. There is a leak of information
between different client connections. One client (an attacker) could use
their connection to intelligently query coturn to get interesting bytes in
the padding bytes from the connection of another client. This has been
fixed in 4.5.1.3.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| coturn | 20.04 LTS focal | Fixed 4.5.1.1-1.1ubuntu0.20.04.1 |
| 19.10 eoan | Fixed 4.5.1.1-1.1ubuntu0.19.10.1 |
| 18.04 LTS bionic | Fixed 4.5.0.7-1ubuntu2.18.04.2 |
| 16.04 LTS xenial | Fixed 4.5.0.3-1ubuntu0.3 |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | None |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-4067)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-4067)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-4067)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-4067)

### Related Ubuntu Security Notices (USN)

+ [USN-4415-1](https://usn.ubuntu.com/USN-4415-1)
+ coTURN vulnerabilities
+ 6 July 2020

### Other references

* <https://github.com/coturn/coturn/security/advisories/GHSA-c8r8-8vp5-6gcm>
* <https://github.com/coturn/coturn/commit/170da1140797748ae85565b5a93a2e35e7b07b6a>
* <https://github.com/coturn/coturn/blob/aab60340b201d55c007bcdc853230f47aa2dfdf1/ChangeLog#L15>
* <https://github.com/coturn/coturn/issues/583>
* <https://www.debian.org/security/2020/dsa-4711>
* <https://www.cve.org/CVERecord?id=CVE-2020-4067>